Previous COVID infection may confer 56% protection against reinfection
A study in Qatar estimates that previous COVID-19 infection imparts 56% protection against future symptomatic infection caused by the highly transmissible Omicron variant, down from about 90% for other SARS-CoV-2 strains.
The study, published yesterday in the New England Journal of Medicine (NEJM), was led by researchers at Weill Cornell Medicine–Qatar in Doha.